BU-911: How to Repair a Laptop Battery

Find out the challenges and limitations of repairing “smart” batteries

Most laptop batteries are smart and consist of the “chemical battery” that is managed by the “digital battery.” A common protocol is the System Management Bus, better known as SMBus.

The typical SMBus battery has five or more battery connections consisting of positive and negative battery terminals, thermistor, clock and data. The connections are often unmarked; however, the positive and negative are commonly located at the outer edges of the connector and the inner contacts accommodate the clock and data. (The one-wire system combines clock and data.) For safety reasons, a separate thermistor wire is brought to the outside. Figure 1 illustrates a battery with six connections.

Figure 1: Terminal connection of a typical laptop battery

The positive and negative terminals are usually placed on the outside; no norm exists on the arrangement of the other contacts.

Courtesy of Cadex

Some batteries are equipped with a solid-state switch that is normally in the “off” position and no voltage is present at the battery terminals. Connecting the switch terminal to ground or pulling it up often turns the battery on. If this does not work, the pack may need a code for activation. Battery manufacturers keep these proprietary codes a well-guarded secret to which even service personnel have no access.

Use a voltmeter to locate the positive and negative battery terminals and establish the polarity. If no voltage is present, a solid-state switch may be in the “off” position and needs activating. Connect the voltmeter to the outer terminals, take a 100-Ohm resistor (other values may also work), tie one end to ground and with the other end touch each terminal while observing the voltmeter. Repeat by tying the resistor to a positive voltage potential. If there is no response, then it is possible that the battery is dead or locked by a code. The 100-Ohm resistor is low enough to engage a digital circuit and high enough to protect the battery against a possible electrical short.

Establishing the connection to the battery terminals should now enable charging. If the charge current stops after 30 seconds, an activation code may be required. Some battery manufacturers add an end-of-battery-life switch that turns the battery off when reaching a certain age or cycle count. They argue that customer satisfaction and safety can only be guaranteed by regularly replacing the battery. Mind you, such a policy also rotates inventory.

If at all possible, connect the thermistor during charging and discharging to protect the battery against possible overheating. Use an ohmmeter to locate the internal thermistor. The most common thermistors are 10 Kilo Ohm NTC, which reads 10kΩ at 20C (68F). NTC stands for negative temperature coefficient, meaning that the resistance decreases with rising temperature. In comparison, a positive temperature coefficient (PTC) causes the resistance to increase. Warming the battery with your hand is sufficient to detect a small change in resistor value when looking for the correct terminal on the battery.

After repair, the fuel gauge might not work, is inaccurate or provides wrong information. The battery may need some sort of an initialization/calibration process by fully charging and discharging the pack to reset the flags. A “flag” is a measuring point to mark and record an event. (See BU-603: How to Calibrate a “Smart” Battery).

The circuits of some smart batteries must be kept “alive” during the replacement of the cells. Disconnecting the voltage for only a fraction of a second can erase vital data in the memory. An analogy is open-heart surgery where doctors must keep all organs of the patient alive. The lost data could contain the resistor value of the digitized shunt that is responsible for the coulomb counter and other data.

To assure continued operation when changing the cells, supply a secondary voltage of same voltage level through a 100-Ohm resistor to the circuit before disconnection. Remove the outside supply only after the circuit receives voltage again from the new cells. Furthermore, some fuel gauge chips run wires to each cell. These must be reassembled in the correct sequence beginning with cell one, then two, three and so forth.

You will also need to be aware of compliance issues. Unlike other regulated standards, the SMBus allows variations and this can cause problems. The repaired SMBus battery should be checked for compatibility with the charger. Batteries for critical uses, such as heathcare, are typically replaced and not repaired. See also www.sbs-forum.org and www.acpi.info.

Simple Guidelines when Repairing Battery Packs

Only connect cells that are matched in capacity. Do not mix cells of different chemistries.

Never charge or discharge Li-ion batteries unattended without a working protection circuit. Each cell must be monitored individually with a protection circuit.

Include a temperature sensor that disrupts the charge current on high heat.

Apply a slow charge to a repaired pack to bring all cells to parity.

Pay attention when using an unknown brand. Elevated temperature hints to an anomaly.

Do not charge a Li-ion battery that has physical damage, has bulged or has dwelled at a voltage of less than 1.5V/cell for some time.

Check a repaired pack for self-discharge. Intrinsic defects often have high self-discharge.

Last updated 2016-01-29

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Batteries in a Portable World

Comments

On March 7, 2011 at 7:00am

mahmood jaser wrote:

hello
i have a laptop battery(10.8volts ,55Wh ) with samsung cells ICR18650-26A
and another laptop battery(10.8 volts ,47Wh,4200mAh)with Sony cells is it posiible to replace each one with the other ? is there will be any damage to my laptop ? what is the meaning of (Wh and mAh )and what is the difference between the two baterries and cells discribed above?
please answer me

On March 11, 2011 at 9:19pm

samir wrote:

no its never ever possible

On April 19, 2011 at 12:38am

Ramya wrote:

1.Can the laptop be used without battery but being plugged in?
2.If battery is charged fully but stilled being plugged in, what is the risk?
3.In certain circumstances of updating, Windows needs th laptop to be plugged in,why is it necessary/

On April 22, 2011 at 5:22pm

Nuno wrote:

Ramya,
answers:
1 -Can the laptop be used without battery but being plugged in?
yes it can. Of course in the event of power failure it will go off on the moment.

2.If battery is charged fully but stilled being plugged in, what is the risk?
Almost none. Li-ion batteries permanently lose capacity. The rate of losing capacity is proporcional to temperature. IF they are exposed to hot temperatures they will have shorter lifes. So, best way to prolong battery life is to charge it to full capacity and store it in the fridge when not needed. Its not very practical dough.

3.In certain circumstances of updating, Windows needs th laptop to be plugged in,why is it necessary/
This happens whenever the time expected to complete the operation is very long. So, if the computer was being run on battery it would be probable it will discharge before the task was done.

Pls Help me with dis….. (1) i;ll like to charge my fone with a dell laptop battery whenever theres no power. can i connect my charger bit to the positive and negative direct to the battery? (2) how to i recharge the laptop battery itself. Can i do this with the charge system in an rechargeable torch?

On June 22, 2011 at 5:30am

Leo Cai wrote:

Dear Purchasing Manager

This is Leo from Better Power Electronic Co.,Ltd. Factory directly with best price and qualtiy laptop battery. CE+RoHS certification. One year warranty

I was inquiring about the C7000 series in order to wake up a couple Dell laptop batteries that have resisted taking any charge after being away from the laptop for an extended period of time.

I was given the following as part of the response:

“Testing Dell Laptop batteries, can however, be a challenge as in many cases they have a protection circuit in the batteries which doesn’t allow it to “handshake” or communicate with the analyzer to get the charge going.”

1. Is there any reliable way to get around the handshake issue?

2. How do I know which Dell laptop batteries have that problem?

3. I understand it was only the older laptop batteries and not the newer
ones that are affected. Is that correct?

Thanks,

Steve

On September 7, 2011 at 8:28am

Ramya wrote:

Though Battery is fully charged…
System shut downs after 15-20 minutes…
But If plugged in works properly..
What would be the problem?

On September 20, 2011 at 7:22am

warren huntley wrote:

sasnyo makes a barret [eneloop] that holds a charg to 85% over a yr. why cant this type batt. be used in comp. with lithium batt. they have ashort shelf life because of internal loss do to impureities in manufacture ,sonyo uses nano technoligy ,

On September 24, 2011 at 8:25am

Doug wrote:

I have a PowerBook g4. The power port on My dc in power board where my power cord plugs in has gone bad. Apple doesn’t make the part anymore so now I’m stuck with a computer that can’t power up. I saw that they sell an external battery charger for all laptops. Is it possible to use my existing power cord and hook it up to my battery to charge it? If yes can you describe in detail how to do so?

On January 7, 2012 at 3:24pm

SPG wrote:

Hi.
is there any way of connecting charger instead of battery?
my laptop doesn’t work from charger but works on battery - can i remove battery and connect charger there to laptop instead of battery?

On January 7, 2012 at 7:20pm

Munna wrote:

One of hcl laptop battery which battery backup time is very much less than expected. No how i improve my btry life.

model is c4500BAT-6 (LI-ION btery pack) is
pls answer me.

On January 20, 2012 at 6:39pm

Munna wrote:

Pls ans. Me.

On February 19, 2012 at 3:20pm

shkenca wrote:

Hi,

I found this site very helpful,
however I still I am not sure hoe to remove the old cells without disconnecting the chip from power. Anyone help me to find wires that feed the chip.
thanks, looking forward for help on this issue

On February 19, 2012 at 3:29pm

shkenca wrote:

Any advice or idea where to get extra tabs, while I build the new battery, besides those that are attached to the cells and others that i sav from the old battery.

thanks

On February 19, 2012 at 3:31pm

shkenca wrote:

Hi,
Any advice or idea where to get extra tabs, while I build the new battery, besides those that are attached to the cells and others that i sav from the old battery.

thanks

On March 1, 2012 at 4:55am

Yason wrote:

I have Dell latitude 620d

From 3 days ago, my Laptop can’t connect the battery..
First i see 100 %..
But It’s just drop cent by cent..

And then, i just ussage power AC and the battery is still not connect to my laptop up today~

Sorry my grammar is bad~

Thanks

On March 13, 2012 at 2:16am

Shannon wrote:

I have just brought a new charger for my Toshiba laptop to replace an old one that had a wire exposed and damaged. The new charger is supplying the correct voltage and turns my computer on and displays 0% available (plugged in,not charging)
Is there power surge protectors installed to avoid damaging your battery or computer hardware on toshiba laptops?
Could the damaged wire have caused a problem with the battery or with my laptop itself ?

On March 18, 2012 at 6:21am

KAILASH wrote:

I have laptop about 2 years old that is Compact professional 610, in which the battery is not taking back up for single second due to sort by high voltage but i can use it during the electricity is available.

Kindly suggest me what should i do or option

On April 19, 2012 at 8:59pm

Moinul Hasan wrote:

I Have rebuild my compaq C700 laptop but its not charging. After few debug i have found that the problem is on the circuit of the battery. is there any way to over come the problem? I found ur blog helpful. If i get any solution to redirect the charging option or any technique to redirect the connection.

On April 21, 2012 at 2:23pm

wale jones wrote:

this is nice

On April 25, 2012 at 5:08am

SN wrote:

Hi, my old battery is BTP-ARJ1 and it was dead.then i bought new one.but it is not charging more than 2% it says plugged in,not charging.so I replace my old battery’s circuit with new one.now the battery is charging but it says “consider replacing battery” same as my old one.is there anything i can do with this.

On April 25, 2012 at 1:39pm

robert leiker wrote:

lots of good info love it

On May 24, 2012 at 7:04am

Jose Alberto Vega wrote:

Where I can find the schematic circuits and components list: SMBus adapter parallel port??
AccPlus program is useless, if not physically connect the battery to the PC through the parallel interface.

View picture here:

http://www.microsys.ro/pi3.jpg

On May 26, 2012 at 5:48pm

Musbaudeen wrote:

Pls help! my hp laptop battery won’t on my laptop,I have to remove the battery to on the system with power source before it will come on, and then put the battery back, & it charges & also retain charge for some time, pls what can i do to fix this.

On May 26, 2012 at 7:41pm

robert leiker wrote:

buy new battery

On June 8, 2012 at 8:42pm

Ray Perry wrote:

after charging 200ah AGM battery with an Arlec 12 battery charger can I leave the pos and neg leads connected after turning off the 240v. It is very awkward to reach the battery charger leads to disconnect them.

On June 9, 2012 at 3:05am

Jose Alberto Vega wrote:

Ok, now I have a module: SMBus adapter parallel port. Well ...
How do I connect to the laptop battery to erase the memory of the eprom?
Many cables, but only seven connectors on the battery ...
I have the program installed on my computer, the parallel port adapter SMBus connected and running, but I don´t know how to connect to the battery, and then, everything is useless…

On June 11, 2012 at 11:36pm

Pankaj wrote:

I’ve Panasonic CF29 tough Book. And it’s battery is giving poor backup from 75% capacity. It gets immediately discharge after 75%. I’ve talked to Panasonic engineers but they said, they have stopped production of this product and unfortunately they also don’t have stock of accessories of this tough book. Can you please tell me How can repaire this battery? It’s a 9 cell battery. I don’t have an option, please help, otherwise I’ve to through this expensive tough book into the Dustbin

On July 1, 2012 at 2:10pm

RK Murthy Challa wrote:

ThanQ Very much and happy to see such an article, which gives immense idea to rebuilt a laptop batteries to every electronic hobbyist

On July 9, 2012 at 8:37am

Nooman Mufti wrote:

Hi,

This was a great article. I had disconnected my Dell Studio 1535 battery circuit from the battery for a whole day and now its not working.

I was hoping you can tell me which ‘Ground’ connection to give the 100 ohm resistor ?
Should I connect one end of the resistor to the ‘Ground’ of the Dell circuit mentioned on this website, while keeping the voltmeter connected to the circuit as well ?

I fear an actvation code is required.
Thank you,
Nooman Mufti

On July 28, 2012 at 4:48am

Aaron wrote:

Hi,
I am facing a problem. I have a notebook of hp 3549tu . its battery does not connect. the battery’s negative prod is on interface but possitive pole is unknown, ics are perhaps short or any other fault. who may repair it.
may you sujest me where to send it for repair?

On July 28, 2012 at 9:37pm

amit wrote:

i have HCL ME laptop and facing problem of “consider a new battery” . My laptop battery is just 2 yr old . Is this is possible to repair my battery?

On August 11, 2012 at 4:34am

Free live chatting wrote:

thanks….

On August 24, 2012 at 5:46pm

ankit wrote:

i want a battery for my HCL laptop.can u suplz help

On August 25, 2012 at 4:20am

Free live chatting wrote:

thanks…

On August 29, 2012 at 11:20pm

lawrence wrote:

I have a toshiba laptop it starts up normally but cannot charge when Ac adapter is pluged in,it works for a few minutes and then shuts down,even with a different adapter and can a laptop use power directly without the batery but with Ac adapter.

thanks

On August 30, 2012 at 7:11am

Ramya wrote:

I think your battery need to be replaced yar…
And Its possible to use laptop plugged in without battery…

On September 6, 2012 at 2:51am

tj wrote:

i found as a temporary battery i can use a 12 volt and a 6 volt battery wired in series to make 18 volts and then solder it onto my laptops old broken charger cable works great i just had the idea the other day and to charge them i just use a lead acid battery charger i can charge them while it is plugged into the laptop the laptop doesnt care still keeps running and will work for most laptops as 18 volts is pretty standard.

On September 6, 2012 at 5:12am

Free live chatting wrote:

thanks…..

On September 20, 2012 at 7:05am

Dheinachandra Salam wrote:

16’’ monitor HCL Laptop
My battery backup is only 20mn, So I want more backup battery.

On October 9, 2012 at 2:15am

Zandinga wrote:

Hi. I’ve a SONY VGP-BPS13/B already without batteries. Does any one know how to jumpstart this battery? Voltage OK in cell terminals but 0 volt in battery pins. Does any one have the pin-out diagram of such battery (7 pins)? I’ve tried the procedure decribed with no success. Thanx!

On October 29, 2012 at 6:20pm

Serena wrote:

Hello i have a Toshiba laptop with a camera and mic -dont know what else-

My battery has said that it needs replacing, But it charges up fully it has said this before and then a few days later the battery was fine, and the battery was fine just a few hours ago but i cut off the laptop while i went to the movie cut it back on and the battery needed replacing , Does this mean the battery really means replacing or that the computer is messed up or something like that?

Please Please Please Answer Me!

On October 31, 2012 at 12:07am

bestbattery168 wrote:

Any advice or idea where to get extra tabs, while I build the new battery, besides those that are attached to the cells and others that i sav from the old battery.
http://www.pcbattery.com.au

On November 5, 2012 at 7:02pm

Teddie wrote:

I have a sony laptop VGN-NW350G. My battery die, so I had to buy a new battery. Then my sis laptop batter die and we share the same batter. Our laptop are different but we have 1h and 30min that this laptop can charge up to. Since we started sharing the same batter, our laptop battery cut the 30min. Now it can only save up to 55min. Can you help me. =.= Oh yeah I find out my sis battery still work.

On November 19, 2012 at 11:01pm

Free live chatting wrote:

nice post…

On December 27, 2012 at 5:24am

dinesh kapadiya wrote:

dear sir palch
all laptop battery prich list send by e-mail

On December 31, 2012 at 12:26am

Nick wrote:

Ok Iam having a problem my laptop is an Dell D600 when ever I turn on the power button it just only glows for 10 second and then stops glowing I remember Tht when my laptop used to work if I would remove the Ac Adaptor it would turn off and Would never charge not for even a Minute anyone got a solution for this problem help will be appreciated

On January 8, 2013 at 11:19pm

taha wrote:

I have a laptop Apple MacBook Pro. Batteries after reaching 1051 cycles has been disabled and the message “Replace Battery” displays., But good battery and a charge of 80% will not use it.
Is there any way to activate the battery?
Thank you

On January 8, 2013 at 11:59pm

taha wrote:

انگلیسیفارسیفرانسویAlpha
I have a laptop, the MacBook Pro 13-inch Apple do., Which has a battery smart. Then after reaching Cycle 1051 disabled, and a message “battery replacement” show., But good battery and a 80% charge, which can be used .
Is there any way to activate the battery?
Meanwhile I’m living in Iran due to international sanctions against Iran have access to Apple spare parts.
I’d be very grateful if someone could help me in this regard.
Thank you again

On January 9, 2013 at 6:02am

cable assembly manufacturers wrote:

Sigma Four is a ISO 9002 compliant company, it’s specialization includes contract a manufacturing of custom cable assemblies and electrical harnesses, power supplies, medical products and services, value added and kitting services, development of prototype systems.

On January 19, 2013 at 8:47am

southlondon roofing wrote:

I think both approaches have their respective pros and cons but I would prefer the torch down approach in a school environment.

On January 25, 2013 at 12:52pm

Amar Sale wrote:

My sony vaio model number VPCEA33EN is showing the battery message as ‘Unknown remaining’.
It is not getting charged and as soon as i remove the charger the laptop shuts off.
I called up the service center and they said that they can replace it but will cost like 150$ or Rs. 8000
Can the battery be repaired ?
Please tell me what to do as i can’t spend that much amount to buy a new battery.

On February 3, 2013 at 1:43am

rami wrote:

my laptop battery output =11 v but its dead now , can i replace the battery with (non specific) AC adapter that’s give me the equivalent output =11 or 15 v ..
could this hurt my motherboard or anything ??

On February 15, 2013 at 4:38pm

RALPH ADYE wrote:

I have replaced the PS for my daughter’s Gateway MX-6436 LT, and the MB, as it sometimes charges the battery, sometimes it doesn’t. Sometimes it runs with the battery out and the PS in, and sometimes it doesn’t. Sometimes it indicates charging, and sometimes it doesn’t. Sometimes it turns off after 30 min as the power meter indicates a low charge, but won’t charge with either PS.
I feel I am chasing a ghost.
Does anyone have any ideas? It it as simple as a battery replacement?
Ralph

On February 16, 2013 at 12:44pm

someboy wrote wrote:

I’ve seen an atrouceous comment here advising to discharge the battery completely

On March 4, 2013 at 9:52pm

superseosolution wrote:

nice article for save laptop battery power please keep its.

On March 5, 2013 at 7:47am

pardeep kumar wrote:

where i buy compaq c794 laptop battery cell in india

On March 5, 2013 at 7:49am

pardeep kumar wrote:

where i buy compaq laptop c794 battery cell in india

On March 24, 2013 at 9:24pm

Daniel MM wrote:

hi, I have a toshiba qosmio f20 laptop , with out a battery pack. I have got spare Ni-cd
re chargeable cells. will anybody kindly help me by providing the circuit diagram for the battery pack , so that I can fabricate it. I am an electronic technician , so if I get the diagram
I can do it myself
Thank you

On March 25, 2013 at 3:40am

Salman wrote:

A question Sir!
Why its is necessary that we must use a cell of same chemistry, we are just dealing with voltage and current. Why the chemistry matters?

On May 14, 2013 at 12:38pm

AJAY KUMAR YADAV wrote:

My sony vaio model number VPCEA33EN is showing the battery message as ‘Unknown remaining’.
It is not getting charged and as soon as i remove the charger the laptop shuts off.
I called up the service center and they said that they can replace it but will cost like 150$ or Rs. 8000
Can the battery be repaired ?
Please tell me what to do as i can’t spend that much amount to buy a new battery.

On May 18, 2013 at 9:17am

a.c.prasanna wrote:

i wont Toshiba c655 s5206 new battery

On May 19, 2013 at 7:16am

A.VELAYUDHANpILLAI wrote:

sir, I have a hp laptop and is one set of cells in battery found weak and replaced delicately. Unfortunately the battery is not recognized by the laptop. I think the pcb inside the battery is not delivering the supply. is it possible to make the battery to working condition.?

On May 26, 2013 at 7:51pm

hardybeo wrote:

How to calibration li-ion battery and minimize wear level ?

On August 9, 2013 at 4:16am

Vas wrote:

Hi,
Sony Vaio relacement battery (of SONY) is not accepted by my note (VPCF1). Not starting, not charging, status unknown, red charging indicator blinking. Tried to patch BIOS with no avail - says model not supported, but I am sure IT IS supported (checked on the specification online). How do I make it work, PLEEEEASE!!!!

On September 3, 2013 at 1:44am

Doris wrote:

Dear Sir,

May i know that how do you repair the laptop batteries? Do you need test the laptop battery before you repair and after you repair well?

Best Regards,
Doris

On September 26, 2013 at 1:32am

zahra wrote:

i have compaq 610. issue is ,it notifies that charger is plugged in,but it does not charge .also, every time i plug out charger,laptop turns off without saving session.

On October 14, 2013 at 11:22am

Abhineet Mishra wrote:

So what do we have to do basically to Maximize the life of a battery… Shall i discharge the battery totally then charge it (everyday) Or should i Keep my Laptop In charging( Always).... What would be better According to YOU…?????

Please Do Reply…......

On November 14, 2013 at 1:56am

Luide Kakembo wrote:

Hello,
I need some help. My laptop (Acer Aspire 5742G) only works on battery power, and not through the A/C connector, even when the battery is disconnected. I have done multiple checks to confirm this.

Would it be possible to connect the A/C power to the battery port directly, since this is the only way to feed power into the Motherboard, and if so, how. I shall give a few ideas I have come up with, any thoughts are welcome:

1. Removing the cells in the battery and connecting the A/C terminals directly to the battery terminals, hence feeding A/C through there.

2. Leaving the battery intact, but insulating off the negative and positive terminals of the battery, then feeding A/C through these terminals onto the motherboard, to “trick” it into thinking a working battery is connected.

Thanks in advance for the help.

On November 22, 2013 at 10:58am

Menageryl wrote:

Why, oh, WHY do 85 percent of the people who post comments seem COMPLETELY incapable of reading and / or thinking??!?!??!!!??
This ENTIRE SITE is dedicated to battery technology people! Damn-near any question you could think of is answered SOMEWHERE here.
You see those headings and sub-headings to the left of the page? They take you to other parts of the site dealing with the information suggested in each heading. Put in just enough effort to open up a couple other pages on THIS SAME SITE and you’ll have your answers! Don’t be so damn lazy you can’t even do that!

Of course, daft questions like “where” to get specific parts, replacements, etc. are NOT going to be found.
You realise this is the Internet, no? And that the author(s) of the site probably DON’T live anywhere near wherever you are.
So explain to me how you expect him (them) to be able to provide answers like that?

<Sighs!> Apologies, but I’ve been going through a number of different pages on this site, and I see the same idiocy repeated painfully on near every one of them.

Good luck guys, I don’t mean any harm, I just want you to think - just a little -for yourself, and exercise your clicking finger a little…

THANKS FOR AN INCREDIBLY COMPREHENSIVE AND INFORMATIVE SITE BTW!!!

On November 24, 2013 at 12:03am

iftikhar ul haq wrote:

sir I have Presario CQ61 Compaq laptop. my battery lost his life and do not work with out plug in. first tell me easy way how can repair it . and secondly I am poor and student not able to buy new one. if u have battery on this model kindly give some concession to me that I buy it. thanks

On December 29, 2013 at 8:47am

Shamsu wrote:

I bought new battery for my acer 4737.but they gave me 4710 battery telling these are same.Now it is Charging fully.But when i running through battery it suddenly off even in 95%.Is it battery fault or my lap? please help me.

On January 2, 2014 at 4:49am

riaz mangat wrote:

how to open a seeled battery

On January 6, 2014 at 2:57pm

chandrashekhar verma wrote:

Sir, my leptop compaq610 version battery show 45% charging but neither take charging & open lettop, when conect adapter and on compuer then battery show plugged in not charging.

On February 2, 2014 at 3:56am

hassan wrote:

hi there I have compaq persario 2500 laptop I have replaced the cell inside battery with new cells having same mAh & volt When I inserted it inside laptop it satrted doing weird thing & UUID is 00000 I have upgraded the Bios but the problem is same the led on Battery cover blinks on 20 plz give some solution

On February 15, 2014 at 1:59am

Stuart wrote:

I have a HP Probook laptop. One of the pins of the battery connection has broken off. Can the connection be replaced or do I have to replace the whole mother board?

On February 15, 2014 at 7:23am

Abdul Momin wrote:

Hai…
My hp laptop battery is down for about one month…it is not charging, but i still using by adapter…is there any problem using lptp without battery?

On February 16, 2014 at 6:13am

Denis Vaden wrote:

Hi, is it possible to simply bypass a solid state switch that requires an activation code?
What if one solders the positive terminal of the battery pack directly to the positive pin of the connector?
In my case I have a 3 cell battery pack from a lenovo netbook, ideapad s10e. It has a 7pin connector. The first pin is the positive and the last (the 7th) is the negative (ground). The individual cells are all new and fully charged (4,2v each). Being connected in series the voltage of the pack is 12.6v. However, the solid state switch cuts off current to the positive pin. What if I connect it directly to the red wire from the battery?
Thank you for your time!

On February 16, 2014 at 8:37pm

Hmm wrote:

My HP laptop G series battery has hardly ever been used. My sister has the same laptop and she uses hers all the time, has even had it longer than mine. She keeps her battery charging all the time. She has no issues.

Just out of the blue, my battery won’t hold a charge for very long. I read online that you can “jump start” a battery with a USB cable with the positive and negative wires stripped. Basically, you zap the battery. The online description talks about locating the positive and negative connectors but doesn’t make mention of these laptop batteries like in the pic above.

Is there a way to jump start the battery or to do a reconditioning procedure (whatever that may be) to get the battery to hold it’s charge? Right now, it only lasts for about 30 minutes when in the past it lasted for several hours or more.

On March 2, 2014 at 11:53am

Monir Hossain wrote:

I have a laptop. My laptop configuration is Hp pro book 4520s. Now i will tell about my laptop problem. The problem is battery. my laptop is not giving backup its totally zero backup but when i input charger in my laptop , my laptop is running through direct electric line.. what is the problem ? please anyone solve my laptop problem.

On March 23, 2014 at 12:16pm

Mike wrote:

Hi, i have a laptop. The problem with my laptop is battery. It stop charging at 25% and soon run down. Pls what can i do to make it charge to 100%?

On April 11, 2014 at 12:12pm

rahman wrote:

i have a laptop. My laptop configuration is Hp-dv5 , my laptop is not giving backup its totally zero backup but when i plugged power code for battry charger in my laptop , my laptop is running through direct electric line but it show…........ 0% available (plugged in, charging) replace battery.
whT SHOULD I DO PLS HELP ME

On May 6, 2014 at 9:38am

samiuddin abro wrote:

hi,
I have disconnect my laptop battery by not use the circuit alive how can be my battery circuit alive again,
I replace new battery but my laptop battery not work for a sec, it shows me 100% full but not work,
now I read on internet about SMBus & (smart battery system) :(

On June 8, 2014 at 12:09pm

TIGRAN wrote:

HI.My old acer extensa 4100 ms xpsp3 notebook show not correct battery voltage 0,001 in disscharge and 0,002 volt in charge time,even when i bought new battery.please answer my its a hardware or software(smbus driver) problem.

REGARDS

On June 10, 2014 at 11:14pm

stephen wrote:

Okay by trying this i was able to restore the charging capability for 30 seconds. I figure that this issue should be able to be fixed with a simple solution outside of buying a new battery since it shows signs of recharging. Any other suggestions?

On June 11, 2014 at 1:08am

TIGRAN wrote:

thanks for answer,battery chatging time is ok.onliy problem is wrong voltage displaying!

On June 11, 2014 at 8:24pm

Luckwinder Singh wrote:

hi, .If battery is charged fully but stilled being plugged in, what is the risk?
or now my laptop battery is charged full show but after 15-20 min my laptop is off os or battery is show 60% after restart ..now can i repair my laptop battery .. m laptop model hp povilion g6 1320 i5 please reply me

I bought a new dellA840 battery & i got discount of 300rupees by the seller by giving my old dell battery of A840 which was 10-15 min backup.
have i got right discount?
what they will do with that battery

On June 23, 2014 at 9:59am

TIGRAN wrote:

just open battery,change battery,change smart setting and like new battery sell you with discount.you are happy about 1 year.when quality battery its a normal,else some time will be BARABOOM(10%).

On June 27, 2014 at 8:41am

HIREN wrote:

can you provide laptop charger circuit diagram?

On June 27, 2014 at 11:39am

TIGRAN wrote:

WHICH MODEL IS YOUR NOTEBOOK?

On July 3, 2014 at 3:09am

HIREN wrote:

I need Vaio E series laptop charger circuit, which has 220v I/P and 19.5V O/P wtih 3.9A at 50-60 HZ….

On July 3, 2014 at 9:34am

TIGRAN wrote:

just bay new or used via EBAY,because some charger unrepairable.one time my opened hp original charger circuid was filled in some solid material.

On July 14, 2014 at 1:44pm

XCT wrote:

Hi
I replaced my hp dv6 battery cells
Before it showed 0% in windows
Now it shows 100% in windows
But it won’t boot on battery
If i boot with ac plugged and i remove it,the laptop shuts down.
What shall i do?
Thanks in advance.

the capacity of my laptop’s battery has totally damaged. It has charged up very quickly & discharges instantly..and also sometimes the battery take 89% or 91% charges only&the; remaining is not completed inspite of direct current. And the machne is suddenly shut down with playing movie,internet surfing…
sir, i am very hopeless & mentally weak at this condition now.. so please give me an ultimate solution,or what should i have to do?

On July 18, 2014 at 2:22pm

TIGRAN wrote:

if your battery is old and was allready few time recalibrated,may show in tray 90-100%,but not disigh capasity.its a last full charge capacity.check it with BATTERYCARE tools and when full charge capasity is less 30% then disign capasity i recomended change battery!

On July 23, 2014 at 8:05pm

Ji Sub Kang wrote:

my laptop battery shuts down suddenly between 80% ~ 90% remaining of charge. is my battery dead ? what should i do ? please help.

On July 23, 2014 at 8:11pm

tigran wrote:

see last comment.

On July 26, 2014 at 1:40pm

ali manj wrote:

please full my laptop battery

On July 26, 2014 at 1:52pm

tigran wrote:

whats wrong on your laptop or garger or battery.write little more about problem?

My sony vaio vbceb46fg model laptop showing 90% battery charge at the time of charging, but when i plug out the power supply it automatically shut down within a fraction of seconds..
so please help me out. Battery status is showing healthy..

On September 8, 2014 at 7:26pm

Ali wrote:

My desktop computer is getting very slow, and I have thought of replacing it with a laptop or notebook or whatever smalled units are available. reading this article about batteries, I wondered if I have to have a battery-operated unit. If I get a smaller system, I still plan on using it maily on my desk at home.

On September 11, 2014 at 2:48am

questionmark wrote:

Excellent description! Just one question, i want to replace a laptop-battery, is it possible to just look for a battery which has got the same Ampere, Volts and shape as the one which is already in my laptop? If not, why not?

Thanks in advance!

On September 15, 2014 at 11:41am

tigran wrote:

not enough. important.battery have art.NN(for example hstnn-dbow HP).be sure your and stock have same oder capability art.NN.one time i purchase via ebay for fujitsu AH300.on internet my searching only 2 stocks said campability,another non.little design diferance.same voltage etc.good wiil be same or more place campability lists on internet.

On September 17, 2014 at 7:12pm

oxil wrote:

Is it possible to replCe 2200mah with 2600mah battery in laptop battery pack.that will work or not .... problm with old battery was to replace due to normal agging of battery

On November 6, 2014 at 8:58pm

chinna wrote:

I am using toshiba satilite c600…i have charging problem in my laptop…if iam using direct power supply in my lap my battery wont charge as well as laptop wont turned on what is the problem…..my adapter is fine and connector is fine….please tell me

On December 14, 2014 at 3:48am

arsalan wrote:

I have fujitsu ah530 laptop i tried to replace the battery cell of my old battery with the same voltage and amphere cells but I failed the battery’s Positive terminal does not have any charge. I arranged another old dead battery from my friend but same results. in both senario the +ve terminal is not having any charge, when placed to laptop it does not
start on battery showing error “0% charge plugged in charging consider replacing your battery”. how to on solid state switch so that their would be a charge on +ve terminal and how can I resolve the issue please help me

On December 14, 2014 at 9:07am

arsalan wrote:

@Tijran

On December 15, 2014 at 1:21am

Marshall wrote:

I had same question like Stuart - have a HP Probook laptop. One of the pins of the battery connection has broken off. Can the connection be replaced or do I have to replace the whole mother board?

On December 15, 2014 at 8:48am

arsalan wrote:

go to a technician he will sold the battery terminal with the broken pin area with a wire

On December 22, 2014 at 1:40pm

Blake wrote:

Hi I have a toshiba satellite c55t-b5110. I was wondering, given that I know for a fact I need a new battery for the laptop, if it is possible to replace the terminals on the laptop where the battery connects to the laptop for the battery to charge.

On December 23, 2014 at 2:13am

Mike wrote:

If the battery is a 2100 mhA can i use new 18650 cells of 4000mhA? will not change the output?

On December 26, 2014 at 8:49am

marrk wrote:

battery charger works but when plugged in to computer the screen goes off but when removed the screen comes on

On January 10, 2015 at 10:41am

Bqehaja wrote:

usefull info

On January 11, 2015 at 10:46pm

Akki wrote:

My laptop batty indicates 0% so i always plug it to power supply and use it. Something strange happened when power cord was removed my laptop was still working for more than 40 min. But it will not turn on with out the power cord connected. Why is ti so?

On January 11, 2015 at 11:02pm

matt wrote:

i hv a compaq 6710b as with many laptops you can buy them with 6 cell battery of if you add more money, you get 9 cells

i was wondering if i could replace the batteries and make it a 9 cell battery

my question is wouldn’t it add more volts to the battery if you add 3 more cells to an ordinary 6 cell battery?

anyone any idea about difference in 6 cell and 9 cell, how it is made to work with same laptop?
would i be able to use the same chip board as 6 cell one with 9 cells?

my battery v10.8 55wh 6 cell

On January 15, 2015 at 1:03am

DS Chauhan wrote:

Dear
1. Can I remove ‘consider replace battery’ from my laptop if yes. how?
2. can I take output from battery

On February 20, 2015 at 10:07pm

Khaldoon Saadi wrote:

I want to be able to charge my laptop battery from 12V car battery safely.

On March 23, 2015 at 12:05pm

AK wrote:

Can some one give me pinout for HP zt3200 battery model no cs-cnx7000 or equivalent?
The problem currently I have is the following.

When the laptop is powered on through mains adapter, charging indicator red light of the laptop comes up for few seconds and the light goes off. Laptop boots normally. On checking the battery status it shows 0% charge.

I had taken out and opened the battery. One pair of cells were dead and I replaced those cells. Discharged all ceels manually. Then charged the cells manually upto 3.7 volts. Individual Cell voltages were from 3.69 to 3.71 volts.

Put the battery again into laptop but the problem remains. Battery showing 0% charge but it didn’t charge. I have checked the voltages at pins. Several pins show voltages ranging from 2.5 to 14 volts. However, non of the pin takes any load indicating that the battery is not allowing power to flow out i.e. the output current seems to be limited by the electronic circuit attached to the battery.

any help would be appreciated. Thanks.

On March 25, 2015 at 7:39am

mohamed Barrie wrote:

my laptops battery got wet and it’s not charging anymore what am I suppose to do.

On April 9, 2015 at 8:41am

Real wrote:

Hi,
I purchase a laptop online and it was shipped to me but the owner just didn’t charge the battery and it arrives at my place with zero charge and I plugged in for a full night but it never charge , is there anyway to wake it up for charging again cause from the owner it was working. Thanks for your help. Regards.

Real

On April 10, 2015 at 10:22pm

Batteryhacker wrote:

Notebook: Dell Isnpirion mini 12

I bought a replacement battery for this notebook because the original Dell (design capacity 48 Wh) has lost its capacity in the years.

New battery:
Typ: NDE076
Capacity: 58 Wh or similar (not 48 Wh!!! - this was the original Dell)

This replacement battery has been replaced in warranty 3 times in 1,5 years!!! Because somehow after time its controller circuit gave up. That means no charging, no energy, no charge report anymore. After the 3rd replacement i deciced to open it and saw the controller (Atmel mega406). The cells were charged, somehow the controller went in a state (probably blocked) that i had to reset it. It has a RESET pin That helped and i had to full charge and full discharge to teach the controller again. I think i will have to repeat it if the problem occurs again!
One must know there is a firmware in this controller and this “blocked state” issue can occur due to a firmware/hardware bug.

If you have a warranty don’t try this, just claim for a replacement.

On May 1, 2015 at 5:41am

Malachy Ekal wrote:

I have a lenovo battery plugged in but not charging and out of warranty.

What can I do

On June 7, 2015 at 1:32pm

salman ansari wrote:

i want to repair my old hp probook 6555b battery due to less time average. it usually gives

40-45 minute after full recharge and sometimes it gives only 30 min or less so kindly send me solution at my email address. thanks

On July 11, 2015 at 5:09am

K. M. Joshi wrote:

I re-celled a laptop battery with 4 cells. After completion, I turned on the laptop but it didn’t power up! The laptop does turn on with AC Adapter plugged in, but if I unplug the charger, the laptop shuts down, as if the the battery has been removed. System (Windows 8) shows that the battery has been charged [Plugged in, charging 100%] but the battery doesn’t power the laptop! Why?
Help!

On August 6, 2015 at 7:56am

Len wrote:

Hi I have Samsung Series 9 ultrabook NP900 X3B A01UK. This ran out of charge and the light on the charger was not on. I replaced the charger with an originL Samsung unit the laptop powered up however the charger appeared to fail immediately and the laptop shut down. On unplugging the charger it was quite warm and again the power light is not on even though the fuse has not blown. It appears something in the laptop is causing the charger to fail. Do you have any advice, could this simply be caused by a failed battery or something more seriously wrong with the laptop?
Kind Regards
Len

On August 17, 2015 at 9:38am

Dick Ayebatonye Deborah wrote:

One of the hook in my HP laptop windows 8 broke.Is there a way I can fix it myself.

On October 7, 2015 at 9:40am

ADJ wrote:

My laptop model is HP PAVILION G6 - 2027TXI5
Battery capacity is - 4200mAh & the voltage is 10.8
My original battery need to be replaced very soon because it’s completely dead. My problem is can I replace a new battery with 12 cells or cells more than 6? If not, what is the maximum cell level for the battery I can replace to my laptop?

On November 14, 2015 at 6:55am

NGE wrote:

it is my first time by here, but I am sure a good place where people can hide a long time. thank you for the pleasure.

On November 20, 2015 at 9:38am

BEHnam++ wrote:

hi
I have bought a new 6 cells battery for my vaio laptop.after 4 or 5 times charging suddenly broke down and it was not charged.
i think the charger board , which is into the battery pack damaged.
so how can i fix it?

On November 27, 2015 at 7:51am

Manyazewal Getachew wrote:

hey
my laptop is dell… batter have 62% avilable but i unplage AC… the laptop shetdown imidetly…. the light that is AC plaging shows dem lighting red…. i try to replaced the batty fowed up from youtube website tutorial but still my battry is not woking…..what shall i do? i am so confused….

Thanks!!!!!!

On December 28, 2015 at 1:45pm

hamdi ahmed wrote:

need help

On January 15, 2016 at 8:14pm

Andrei Dulipovici wrote:

Please tell me what type of battery can replace mine, from a Toshiba laptop. I guess is an obsolete type because I do not see it in any catalog.
The code is:
PA3399V-1BRS
Li-ion 10.8 V 6600mAh

Thank you a lot.

On February 16, 2016 at 6:25am

sav wrote:

Hi,

could you be more specific of how we can add this secondary voltage through a 100-Ohm resistor before we remove the old cells from the BMS? How can we practically do that? It would be nice if you also show us a picture of that.

Thanks
Sav

On February 28, 2016 at 10:52pm

Sutajit Paul wrote:

I have a extra laptop battery and I want to make a chargeable fan and not able to find the out put points of the battery so

Can some one help me with the 12V positive and negative point of a laptop battery

and how to recharge the battery without laptop..

On March 21, 2016 at 1:38am

goodbattery wrote:

On January 15, 2016 at 8:14pm

Andrei Dulipovici wrote:

Please tell me what type of battery can replace mine, from a Toshiba laptop. I guess is an obsolete type because I do not see it in any catalog.
The code is:
PA3399V-1BRS
Li-ion 10.8 V 6600mAh

I never use my laptop about 1year its battery have some different problem its battery can charge but can’t give power to laptop after plugging out. I think laptop is ok the problem is in battery and the battery always getting charging but not become full please tell me its solutions if any. When i plug charger to laptop after 6 or 7 sec it will start charging.

On May 25, 2016 at 12:49am

BEHnam++ wrote:

>>>TO‌:Sutajit Paul
hi Sutajit
Im interested in your project. I‌ think I can help you but i need some data about your battery.
please contact me by this email address: smbTabatabaei@gmail.com

On May 25, 2016 at 1:10am

BEHnam++ wrote:

>>>>TO babar
hi babar
don’t worry your laptop is ok. just your battery cells cant save charge chemicaly . I read a paper some where about old batteries. it said put the old batteries into freezer for 24 hour . the problem will fix.
I don’t test this way myself . if you want do that , put the battery into a plastic packet first.
inform me about the result please.>> smbTabatabaei@gmail.com

On May 29, 2016 at 8:02pm

Akash kumar wrote:

https://youtu.be/WJaXDww1oJE
This video clearly explains the procedure to repair any laptop charger

On May 31, 2016 at 11:10am

Aimbee monday wrote:

My laptop is Dell product wen i plug in wth AC it wil show not charging n wil go off once there is an interuption in AC supply…what shud i do?

On July 4, 2016 at 9:59am

behrad wrote:

Please tell me what type of battery can replace mine, from a Toshiba laptop. I guess is an obsolete type because I do not see it in any catalog.
The code is:
PA3399V-1BRS
Li-ion 10.8 V 6600mAh
http://fixr.ir
Thank you a lot.

On July 21, 2016 at 1:41am

lihle wrote:

please help me, Im using an ASUS with an internal battery and it won’t charge, the charger needs to be plugged on and when removed it switches off,is there a way of fixing the battery or i have to buy another one. Its the X551M.

On July 21, 2016 at 1:26pm

Oto wrote:

“consider replacing your battery” in Windows 7 which is shown when battery life is less than 40% can be removed by installing this update - https://support.microsoft.com/en-us/kb/2293330

It is for specific HP laptops but to install on other laptops open a cmd prompt and run the following

dism /online /add-package /packagepath:

On August 6, 2016 at 4:15pm

Chris Lewis wrote:

I have a HP Pavilion laptop which is around one year old, it’s very rarely used only a few hours use. When I tried to use it recently I found that the battery was on 0% and charging (although it was taking no charge). The laptop trouble shooter is indicating a failed battery. I find this strange with a laptop with very little use. Could this be something to do with the battery going completely flat and the charging has been deactivated?

On August 12, 2016 at 1:10pm

abhi wrote:

Please help
I have Lenovo z510 battery which is not taking charging any more so i e decide to open it.
After opening i found that its cells are working and when i check the voltage with the help of multimeter its shows 14 volt however when i check the voltage across the terminals of the battery it shows nothing.
So kindly tell me whats the problem wirh it ?
It has 4 cell internal battery of 15 v n 32000 mah.

On August 18, 2016 at 8:49am

Daniel wrote:

how to check li-ion battery pack a3ini302 for self-discharge

On September 3, 2016 at 11:34am

Israel Oluwaseun TAIWO wrote:

I use an ASUS F200 LA computer. The battery was not charging. When plugged in, it will display charging, but it won’t leave 0%, and it switches off immediately when it is not on an external source of power, so an engineer helped me in boosting it by charging it through its positive and negative terminals after loosing the battery, then it charged to 58%, but it will still not increase when charged with the laptops charger, and when the power adapter is unplugged, it switches off immediately. Please what can u do.

I had to dissipate the battery of my system sometimes ago. Since then, it has not been charging. When plugged in power, it will say charging, but it won’t increase, and whenever I remove the power cable, it will power off immediately. Today, a friend assisted me in boosting the battery, by removing the inbuilt battery, and charging it through its positive and negative wires. When we inserted it into the computer, and attempted to power it on without the adapter, it did not power on. When we inserted the power cable, the system came on as usual, but now it had charged to 58%. Yet it won’t power on without the power plugged into electricity, and it will power off immediately the electricity is disconnected.

What I know is that;
The battery cell can be charged directly, but not with the adapter.
The system is only working on external power not on battery.

Please what can I do to rectify this problem?

On October 5, 2016 at 12:49pm

Oto wrote:

If battery doesn’t hold the charge then it is considered dead. Dead batteries seem to be charging to even 100% but they don’t have power to keep laptop powered on.

What does show DESIGN CAPACITY, FULL CHARGE CAPACITY in batteryhealth.html from Desktop, if you run this command in Win10? powercfg.exe -batteryreport /output %userprofile%/Desktop/batteryhealth.html

>>abhi wrote:
Please help I have Lenovo z510 battery

as written in article there is switch which doesn’t let power to terminals. You could boost each cell directly with 5V a little bit(30sec) so laptop can charge it again,

On October 13, 2016 at 3:41am

Daniel Moss wrote:

Hi,
I have a laptop battery which is suspect. However, I am not sure whether it is a problem with the cells or a problem with the way the laptop is charging the battery. I have opened up the battery. It is organised into three pairs of cells. Each pair is connected in parallel.
I don’t want to disconnect the cells from the battery circuit board, so I was wondering if I can connect my 18650 battery charger and charge (in place), each pair of batteries in turn?

On October 27, 2016 at 3:34am

Ravi wrote:

I have a laptop asus k53sm.
Which cells shall i use to repair its battery and how can i open it. I do not see any clue to open it ?

Thank you

On October 30, 2016 at 7:27pm

George wrote:

Hi
I replaced my laptops battery cells. Now when I connect the battery to laptop it says fully charged but when I unplug the AC adaptor the laptop shuts down imidiately like I have no battery on it.
I checked all connections and all it’s fine. The plus and minus terminals of the battery have zero volts but the cells have 11.5 volts. I use the resistor to activate the solid-state switch but with no luck. I have to mention that I replaced the cells without keeping “alive” the circuit board.
Why is this happening? Is there any way to bypass the board?
thanks

On November 9, 2016 at 3:41pm

Mistar Odd wrote:

Sir…My HP laptop battery stopped working/charging…is there a possible way to fix it?

1. Can these be safely replaced?
2. What are the best replacement Li-Ion batteries to use to replace the SANYOs?
3. Is it 3.6V or 3.7V…?
4. What mAh capacity would be best to use?
5. Can I increase the 4200mAh to what amount and how?
6. What do the ‘‘K’’ and ‘‘R2112”’ and ‘P23B’’ etched on the cells’ plastic covers mean?
7. How can one identify and differentiate clearly between the various types of these Li-Ion batteries?

Thanks to all your comments and advice.

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